Derm Dx: Red, subcutaneous nodule on an infant's scalp

An 8-month-old female was referred by her pediatrician for evaluation of a red lesion that has been present on her head since birth. Her mother’s pregnancy was normal, and the baby was born by vaginal delivery. Her medical history is unremarkable, and her immunizations are up-to-date. Physical examination revealed a well-circumscribed, slightly compressible, deeply erythematous, subcutaneous nodule arising from the ...